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I ran into about the same problem (Windows 7 Enterprise 64 bit). I then was using the 64bit Version of Internet Explorer 9. I was able to resolve my issue as follows:

The ActiveX control of Trend Micro is 32bit which will not work with a 64bit Internet Explorer. I tried using the Trend Micro Web Installer with the 32bit Internet Explorer (check for absence of 64bit in ?->Info!). Et voila: everything worked just fine.